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下列对日常生活中的某些做法或认识没有科学依据的是（ ）

A.食用合格“碘盐”，可预防某种甲状腺疾病

B．胃酸分泌过少的人，可常用少量的食醋作调味品，既增进食欲，又使疾病得到治疗

C．长期饮用优质纯净水，有利于身体健康 D．维生素可以调节人体的新陈代谢